Particulate organic carbon export across the Antarctic Circumpolar Current at 10°E: Differences between north and south of the Antarctic Polar Front
16 pages, 7 figures, 4 tables The vertical distribution of 234Th was measured along the 10°E meridian between 44°S and 53°S in the Antarctic Circumpolar Current (ACC) during the austral summer of 2012. The overarching goal of this work was to estimate particulate organic carbon (POC) export across t...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
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Format: | Article in Journal/Newspaper |
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Online Access: | http://hdl.handle.net/10261/306286 https://doi.org/10.1016/j.dsr2.2016.05.016 |
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ftcsic:oai:digital.csic.es:10261/306286 2024-02-11T09:58:26+01:00 Particulate organic carbon export across the Antarctic Circumpolar Current at 10°E: Differences between north and south of the Antarctic Polar Front Puigcorbé, Viena Roca-Martí, Montserrat Masqué, Pere Benítez-Nelson, Claudia Rutgers v. d. Loeff, Rutgers Laglera, Luis M. Bracher, Astrid Cheah, Wee Strass, Volker Hoppema, Mario Santos-Echeandía, Juan Hunt, Brian P.V. Pakhomov, Evgeny A. Klaas, Christine Ministerio de Ciencia e Innovación (España) Generalitat de Catalunya Ministerio de Asuntos Económicos y Transformación Digital (España) Federal Ministry of Education and Research (Germany) 2017 http://hdl.handle.net/10261/306286 https://doi.org/10.1016/j.dsr2.2016.05.016 en eng Elsevier #PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/MICINN//CTM2011-14027-E/ES/TASAS DE EXPORTACION Y REMINERALIZACION DE CARBONO ORGANICO PARTICULADO EN EDDIES DEL OCEANOA AUSTRAL (EDDY PUMP)/ info:eu-repo/grantAgreement/ME//AP2010-2510/ES/AP2010-2510/ info:eu-repo/grantAgreement/MICINN//CGL2010-11846-E/ES/EL PAPEL DEL HIERRO EN EL INTERCAMBIO DE CO2 ENTRE EL OCEANO AUSTRAL Y LA ATMOSFERA/ https://doi.org/10.1016/j.dsr2.2016.05.016 Sí Deep Sea Research - Part II - Topical Studies in Oceanography 138: 86-101 (2017) 0967-0645 http://hdl.handle.net/10261/306286 doi:10.1016/j.dsr2.2016.05.016 1879-0100 none Particulate organic carbon export Thorium Southern Ocean Antarctic Circumpolar Current Polar Front Export efficiency Transfer efficiency Plankton community artículo 2017 ftcsic https://doi.org/10.1016/j.dsr2.2016.05.016 2024-01-16T11:40:25Z 16 pages, 7 figures, 4 tables The vertical distribution of 234Th was measured along the 10°E meridian between 44°S and 53°S in the Antarctic Circumpolar Current (ACC) during the austral summer of 2012. The overarching goal of this work was to estimate particulate organic carbon (POC) export across three fronts: the Sub-Antarctic Front (SAF), the Antarctic Polar Front (APF) and the Southern Polar Front (SPF). Steady state export fluxes of 234Th in the upper 100 m ranged from 1600 to 2600 dpm m−2 d−1, decreasing with increasing latitude. Using large particle (>53 μm) C/234Th ratios, the 234Th-derived POC fluxes at 100 m ranged from 25 to 41 mmol C m−2 d−1. Observed C/234Th ratios decreased with increasing depth north of the APF while south of the APF, ratios remained similar or even increased with depth. These changes in C/234Th ratios are likely due to differences in the food web. Indeed, satellite images, together with macronutrients and dissolved iron concentrations suggest two different planktonic community structures north and south of the APF. Our results indicate that higher ratios of POC flux at 100 m to primary production occurred in nanophytoplankton dominated surface waters, where primary production rates were lower. Satellite images prior to the expedition suggest that the higher export efficiencies obtained in the northern half of the transect may be the result of the decoupling between production and export (Buesseler 1998). Transfer efficiencies to 400 m, i.e. the fraction of exported POC that reached 400 m, were found to be higher south of the APF, where diatoms were dominant and salps largely abundant. This suggests different remineralization pathways of sinking particles, influencing the transfer efficiency of exported POC to depth. Financial support for this project was provided by the Ministerio de Ciencia e Innovación (CTM2011-14027-E, Spain) and the Generalitat de Catalunya to the research group MERS (2014 SGR-1365). VP and MR-M have been funded by Ph.D. fellowships from the Spanish ... Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Digital.CSIC (Spanish National Research Council) Antarctic Austral Southern Ocean The Antarctic Deep Sea Research Part II: Topical Studies in Oceanography 138 86 101 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
Particulate organic carbon export Thorium Southern Ocean Antarctic Circumpolar Current Polar Front Export efficiency Transfer efficiency Plankton community |
spellingShingle |
Particulate organic carbon export Thorium Southern Ocean Antarctic Circumpolar Current Polar Front Export efficiency Transfer efficiency Plankton community Puigcorbé, Viena Roca-Martí, Montserrat Masqué, Pere Benítez-Nelson, Claudia Rutgers v. d. Loeff, Rutgers Laglera, Luis M. Bracher, Astrid Cheah, Wee Strass, Volker Hoppema, Mario Santos-Echeandía, Juan Hunt, Brian P.V. Pakhomov, Evgeny A. Klaas, Christine Particulate organic carbon export across the Antarctic Circumpolar Current at 10°E: Differences between north and south of the Antarctic Polar Front |
topic_facet |
Particulate organic carbon export Thorium Southern Ocean Antarctic Circumpolar Current Polar Front Export efficiency Transfer efficiency Plankton community |
description |
16 pages, 7 figures, 4 tables The vertical distribution of 234Th was measured along the 10°E meridian between 44°S and 53°S in the Antarctic Circumpolar Current (ACC) during the austral summer of 2012. The overarching goal of this work was to estimate particulate organic carbon (POC) export across three fronts: the Sub-Antarctic Front (SAF), the Antarctic Polar Front (APF) and the Southern Polar Front (SPF). Steady state export fluxes of 234Th in the upper 100 m ranged from 1600 to 2600 dpm m−2 d−1, decreasing with increasing latitude. Using large particle (>53 μm) C/234Th ratios, the 234Th-derived POC fluxes at 100 m ranged from 25 to 41 mmol C m−2 d−1. Observed C/234Th ratios decreased with increasing depth north of the APF while south of the APF, ratios remained similar or even increased with depth. These changes in C/234Th ratios are likely due to differences in the food web. Indeed, satellite images, together with macronutrients and dissolved iron concentrations suggest two different planktonic community structures north and south of the APF. Our results indicate that higher ratios of POC flux at 100 m to primary production occurred in nanophytoplankton dominated surface waters, where primary production rates were lower. Satellite images prior to the expedition suggest that the higher export efficiencies obtained in the northern half of the transect may be the result of the decoupling between production and export (Buesseler 1998). Transfer efficiencies to 400 m, i.e. the fraction of exported POC that reached 400 m, were found to be higher south of the APF, where diatoms were dominant and salps largely abundant. This suggests different remineralization pathways of sinking particles, influencing the transfer efficiency of exported POC to depth. Financial support for this project was provided by the Ministerio de Ciencia e Innovación (CTM2011-14027-E, Spain) and the Generalitat de Catalunya to the research group MERS (2014 SGR-1365). VP and MR-M have been funded by Ph.D. fellowships from the Spanish ... |
author2 |
Ministerio de Ciencia e Innovación (España) Generalitat de Catalunya Ministerio de Asuntos Económicos y Transformación Digital (España) Federal Ministry of Education and Research (Germany) |
format |
Article in Journal/Newspaper |
author |
Puigcorbé, Viena Roca-Martí, Montserrat Masqué, Pere Benítez-Nelson, Claudia Rutgers v. d. Loeff, Rutgers Laglera, Luis M. Bracher, Astrid Cheah, Wee Strass, Volker Hoppema, Mario Santos-Echeandía, Juan Hunt, Brian P.V. Pakhomov, Evgeny A. Klaas, Christine |
author_facet |
Puigcorbé, Viena Roca-Martí, Montserrat Masqué, Pere Benítez-Nelson, Claudia Rutgers v. d. Loeff, Rutgers Laglera, Luis M. Bracher, Astrid Cheah, Wee Strass, Volker Hoppema, Mario Santos-Echeandía, Juan Hunt, Brian P.V. Pakhomov, Evgeny A. Klaas, Christine |
author_sort |
Puigcorbé, Viena |
title |
Particulate organic carbon export across the Antarctic Circumpolar Current at 10°E: Differences between north and south of the Antarctic Polar Front |
title_short |
Particulate organic carbon export across the Antarctic Circumpolar Current at 10°E: Differences between north and south of the Antarctic Polar Front |
title_full |
Particulate organic carbon export across the Antarctic Circumpolar Current at 10°E: Differences between north and south of the Antarctic Polar Front |
title_fullStr |
Particulate organic carbon export across the Antarctic Circumpolar Current at 10°E: Differences between north and south of the Antarctic Polar Front |
title_full_unstemmed |
Particulate organic carbon export across the Antarctic Circumpolar Current at 10°E: Differences between north and south of the Antarctic Polar Front |
title_sort |
particulate organic carbon export across the antarctic circumpolar current at 10°e: differences between north and south of the antarctic polar front |
publisher |
Elsevier |
publishDate |
2017 |
url |
http://hdl.handle.net/10261/306286 https://doi.org/10.1016/j.dsr2.2016.05.016 |
geographic |
Antarctic Austral Southern Ocean The Antarctic |
geographic_facet |
Antarctic Austral Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_relation |
#PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/MICINN//CTM2011-14027-E/ES/TASAS DE EXPORTACION Y REMINERALIZACION DE CARBONO ORGANICO PARTICULADO EN EDDIES DEL OCEANOA AUSTRAL (EDDY PUMP)/ info:eu-repo/grantAgreement/ME//AP2010-2510/ES/AP2010-2510/ info:eu-repo/grantAgreement/MICINN//CGL2010-11846-E/ES/EL PAPEL DEL HIERRO EN EL INTERCAMBIO DE CO2 ENTRE EL OCEANO AUSTRAL Y LA ATMOSFERA/ https://doi.org/10.1016/j.dsr2.2016.05.016 Sí Deep Sea Research - Part II - Topical Studies in Oceanography 138: 86-101 (2017) 0967-0645 http://hdl.handle.net/10261/306286 doi:10.1016/j.dsr2.2016.05.016 1879-0100 |
op_rights |
none |
op_doi |
https://doi.org/10.1016/j.dsr2.2016.05.016 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
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138 |
container_start_page |
86 |
op_container_end_page |
101 |
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